OFFSET
0,4
LINKS
Wikipedia, Partition of a set
FORMULA
a(n) = A203986(n,n).
EXAMPLE
a(0) = 1: empty.
a(1) = 1: 1.
a(2) = 1: 14|23.
a(3) = 2: 168|249|357, 159|267|348.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Alois P. Heinz, Oct 31 2018
STATUS
approved